Geodesic
On the adiabatic definition of the $S$ matrix in the formalism of $L$ functionals
Teoretičeskaâ i matematičeskaâ fizika, Tome 16 (1973) no. 2, pp. 169-177 Cet article a éte moissonné depuis la source Math-Net.Ru

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An operator that is the analog of the renormalized $S$ matrix in one of the possible formulations of quantum theory is defined in terms of positive-definite functionals on the algebra of observables. 
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     author = {Yu. S. Tyupkin},
     title = {On the adiabatic definition of the $S$ matrix in the formalism of $L$ functionals},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {169--177},
     year = {1973},
     volume = {16},
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Yu. S. Tyupkin. On the adiabatic definition of the $S$ matrix in the formalism of $L$ functionals. Teoretičeskaâ i matematičeskaâ fizika, Tome 16 (1973) no. 2, pp. 169-177. http://geodesic.mathdoc.fr/item/TMF_1973_16_2_a2/

[1] V. N. Likhachev, Yu. S. Tyupkin, A. S. Shvarts, TMF, 2 (1970), 3

[2] V. N. Likhachev, Yu. S. Tyupkin, A. S. Shvarts, TMF, 10 (1972), 63

[3] A. S. Shvarts, DAN SSSR, 173 (1967), 793 | Zbl

[4] A. S. Shvarts, Tr. Mosk. matem. ob-va, 1970, no. 22, 127

[5] L. D. Keldysh, ZhETF, 47 (1964), 1515